EXP Booster is a Medal in Bug Fables. It lets the party earn 50% more EXP from battles, but lowers their attack by 1.
Usage
It may hasten the processing of ranking up, so long as the party can still win battles with 1 less attack. Generally, it should not be used against enemies with defenses too high for the team to fight.
If used with RUIGEE active, then it decreases attack by 1 while giving no rewards in return, and it costs 1 MP, thus making this one of the only pure challenge medals with no rewards.
If one somehow obtains multiple EXP Boosters through glitches or save editing, the effects stack.
How to Acquire
There is 1 EXP Booster medal available. It can be found right when Chapter 3 starts, in the Underground Tavern.
Underground Tavern
When Chapter 3 starts, this medal can be bought from Shades in the Underground Tavern for 2 crystal berries.